Why is my Vitron 100/30 showing Bulk charging when the battery is full at 13.5v ? I have 2 126Ah Allion Lithium batteries in Parallel for 252Ah with Bluetooth and showing 100%SOC.
asked
Bulk Charging with 100% SOC
Charging batteries from solar only can create a false reset to 100% due to cloud cover.
The BMS will typically reset it's state of charge accumulation to 100% when the battery voltage reaches a preset value AND the current drops below the "tail current" setting.
If the voltage is above the preset value and a solar output drops below the tail current then the BMS will reset. To avoid this, set the voltage to 0.2 volts under the absorption voltage.
MPPT probably has absorption set at 14.4v. When it bulk it delivers max amps into the battery to bring it up to value set in absorption, then it switches to absorption mode and the amps and voltage of the battery drops slowly to float.
Double check that values in the MPPT match what the manufacture recommends. Switch to full SOC at 13.5 does not seem right, mine switch at 14.2, the setting in my battery monitoring shunt
Looks like all is well as it finally went up to 14.2V and into absorption and finally Float. It took the 330W solar panels a little longer to achieve this.
Are your batteries AGM or LiFePO4? I suspect the latter and a BMS in them.
Might need to tweak the MPPT and multiplus settings.
Batteries are Allion LiFePO4. all ok now.
your answer "The batteries are Allion LiFePO4. Everything is fine now. " is based on voltage or SOC?
It would be a good idea to set a low-voltage alarm just above the critical voltage of the batteries.
If your battery is declared @100% with a still relatively high charging current in absorption, your actual battery charge may drop every day and you will still see the battery at 100%.
At the price of 2500Ah batteries, putting an alarm is cheap.
Pierre
